/*!A cross-platform build utility based on Lua
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright (C) 2015-present, TBOOX Open Source Group.
 *
 * @author      ruki
 * @file        split.c
 *
 */

/* *******************************************************
 * trace
 */
#define XU_TRACE_MODULE_NAME "string_split"
#define XU_TRACE_MODULE_DEBUG (0)

/* *******************************************************
 * includes
 */
#include "xmake/string/prefix.h"

/* *******************************************************
 * private implementation
 */
static xu_void_t xm_string_split_str(lua_State* lua, xu_char_t const* cstr, xu_size_t nstr, xu_char_t const* cdls,
                                     xu_size_t ndls, xu_bool_t strict, xu_int_t limit)
{
    xu_int_t         num = 0;
    xu_char_t const* end = cstr + nstr;
    xu_char_t const* pos = xu_strstr(cstr, cdls); // faster than xu_strnstr()
    while (pos && pos < end)
    {
        if (pos > cstr || strict)
        {
            if (limit > 0 && num + 1 >= limit) break;

            lua_pushlstring(lua, cstr, pos - cstr);
            lua_rawseti(lua, -2, ++num);
        }

        cstr = pos + ndls;
        pos  = xu_strstr(cstr, cdls);
    }
    if (cstr < end)
    {
        lua_pushlstring(lua, cstr, end - cstr);
        lua_rawseti(lua, -2, ++num);
    }
    else if (strict && (limit < 0 || num < limit) && cstr == end)
    {
        lua_pushliteral(lua, "");
        lua_rawseti(lua, -2, ++num);
    }
}
static xu_void_t xm_string_split_chr(lua_State* lua, xu_char_t const* cstr, xu_size_t nstr, xu_char_t ch,
                                     xu_bool_t strict, xu_int_t limit)
{
    xu_int_t         num = 0;
    xu_char_t const* end = cstr + nstr;
    xu_char_t const* pos = xu_strchr(cstr, ch); // faster than xu_strnchr()
    while (pos && pos < end)
    {
        if (pos > cstr || strict)
        {
            if (limit > 0 && num + 1 >= limit) break;

            lua_pushlstring(lua, cstr, pos - cstr);
            lua_rawseti(lua, -2, ++num);
        }

        cstr = pos + 1;
        pos  = xu_strchr(cstr, ch);
    }
    if (cstr < end)
    {
        lua_pushlstring(lua, cstr, end - cstr);
        lua_rawseti(lua, -2, ++num);
    }
    else if (strict && (limit < 0 || num < limit) && cstr == end)
    {
        lua_pushliteral(lua, "");
        lua_rawseti(lua, -2, ++num);
    }
}

/* *******************************************************
 * implementation
 */

/* split string (only support plain text)
 *
 * @param str             the string
 * @param delimiter       the delimiter
 * @param strict          is strict?
 * @param limit           the limit count
 */
xu_int_t xm_string_split(lua_State* lua)
{
    // check
    xu_assert_and_check_return_val(lua, 0);

    // get string
    size_t           nstr = 0;
    xu_char_t const* cstr = luaL_checklstring(lua, 1, &nstr);

    // get delimiter
    size_t           ndls = 0;
    xu_char_t const* cdls = luaL_checklstring(lua, 2, &ndls);

    // is strict?
    xu_bool_t const strict = (xu_bool_t)lua_toboolean(lua, 3);

    // get limit count
    xu_int_t const limit = (xu_int_t)luaL_optinteger(lua, 4, -1);

    // split it
    lua_newtable(lua);
    if (ndls == 1)
        xm_string_split_chr(lua, cstr, (xu_size_t)nstr, cdls[0], strict, limit);
    else
        xm_string_split_str(lua, cstr, (xu_size_t)nstr, cdls, ndls, strict, limit);
    return 1;
}
